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README.md

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+As of v1.3.0, a command for getting/setting coins of a player could look like this:
+```java
+public class CoinsCommand {
+
+    @Getter
+    private final CommandNode<CommandContext<CommandSender>> rootNode;
+    private final CommandArgument<CommandContext<CommandSender>, OfflinePlayer> playerArg;
+    private final CommandArgument<CommandContext<CommandSender>, Integer> amountArg;
+
+    public CoinsCommand() {
+        rootNode = ScrowAPI.getCommandManager().createNode("coins");
+        this.playerArg = ScrowAPI.getCommandManager().createArgument("player", OfflinePlayerArgumentType.getInstance());
+        this.amountArg = ScrowAPI.getCommandManager().createArgument("amount", IntegerArgumentType.getInstance());
+
+        {
+            var setLiteral = ScrowAPI.getCommandManager().createNode("set");
+            rootNode.addLiteral(setLiteral);
+            setLiteral.addArgument(playerArg);
+            setLiteral.addArgument(amountArg);
+            setLiteral.setExecutor(this::setCoins);
+        }
+        {
+            var getLiteral = ScrowAPI.getCommandManager().createNode("get");
+            rootNode.addLiteral(getLiteral);
+            getLiteral.addArgument(playerArg);
+            getLiteral.setExecutor(this::getCoins);
+        }
+    }
+
+    private void getCoins(CommandContext<CommandSender> ctx) {
+        var player = ctx.getArg(playerArg);
+
+        ScrowAPI.getEconomyService()
+                .getCoins(player.getUniqueId())
+                .subscribeOn(Schedulers.boundedElastic())
+                .publishOn(ScrowAPI.getMinecraftScheduler())
+                .subscribe(amount -> {
+                    if (player == ctx.getSender()) {
+                        ctx.getSender().sendMessage("You have " + amount + "$");
+                    } else {
+                        ctx.getSender().sendMessage(player.getName() + " has " + amount + "$");
+                    }
+                }, err -> {
+                    ctx.getSender().sendMessage("Unable to get coins: " + err.getMessage());
+                    Bukkit.getLogger().log(Level.SEVERE, "Unable to get coins of " + player.getUniqueId(), err);
+                });
+    }
+
+    private void setCoins(CommandContext<CommandSender> ctx) {
+        var player = ctx.getArg(playerArg);
+        var amount = ctx.getArg(amountArg);
+
+        ScrowAPI.getEconomyService()
+                .setCoins(player.getUniqueId(), amount)
+                .subscribeOn(Schedulers.boundedElastic())
+                .publishOn(ScrowAPI.getMinecraftScheduler())
+                .subscribe(__ -> {
+                    ctx.getSender().sendMessage(player.getName() + " now has " + amount + "$");
+                }, err -> {
+                    ctx.getSender().sendMessage("Unable to set coins: " + err.getMessage());
+                    Bukkit.getLogger().log(Level.SEVERE, "Unable to set coins of " + player.getUniqueId() + " to " + amount, err);
+                });
+    }
+}
+```
+Registered with
+```java
+ScrowAPI.getCommandManager().register(new CoinsCommand().getRootNode());
+```